Valve seat dresser



June 1, 1937. F. .1. PARDIECK VALVE SEAT DRESSER Filed May 12, 1934 mayCil

Patented June 1, 1937 UNITED STATES PATENT orries- 2 Claims.

My invention is concerned with tools for facing the valve-seats ofplumbing fixtures, and particularly with tools adapted to finish valveseats to a form other than planar. Plumbingfixture valve-seats of thetype with which I am particularly concerned are provided with anupwardly extending annular rib or flange which is adapted to be engagedby a valve faced with some suitable compressible material. If suchvalve-seats are re-faced merely by the removal of material from theirupper surfaces, the effective height of the annular rib is reduced andmay become so small that insufficient clearance is provided to secure afirm contact between the valve-seat and the co-operating valveof myinvention is to provide the re-facing tool with a cutting element whichwill normally be securely held in association with the remainder of thetool but which can be removed readily when desired. 7

In carrying out my invention I provide a conical =cap threadedinteriorly and exteriorly so that it can be secured in line with theopening of the plumbing-fixture from which the valve has been removed,and in this cap ,I mount, through the medium of screw-threads, a hollowsleeve which slidably and rotatably receives the shank of thecutting-head. The cutting-headdifferent sizes of which may be used, isadapted for attachment to the lower end of the shank and is of generallyconical form to enter and be centered by the valve seat. Thecutting-head is provided with an axially slidable cutting element theposition of which is adjusted by means of a feedrod that extendsupwardly through the shank and is screw-threadedly connected thereto forpurposes of adjustment. Means are provided for normally retaining thecutting element in association with the head, such means being arrangedto permit removal of the cutting element when desired.

The accompanying drawing illustrates my invention: 1 is an axial sectionthrough the re-facing tool in association with a faucet; Fig. 2 is a,transverse section on the line 22 of Fig. 1; Fig. 3 is a side elevationof the screw-threaded cap; Fig. 4 is an axial section on the line 44 ofFig. 6 through a cutting head; Fig. 5 is a generally axial section onthe line 55 of Fig. 4; and Fig. 6 is a transverse section on theline6--6 of Fig. 4.

The faucet Hi illustrated in Fig. 1 is of a common type. It has athreaded end H for attachment to a supply pipe and an upwardly extendingneck I2 in which the valve is mounted. The valve seat l3, with which thevalve co-operates, 10 is disposed in line with the neck I2 and providedwith an upwardly projecting annular rib or flange {4 which immediatelysurrounds the valve opening and which, when-the valve is closed, is infirm contact with a eompressi-ble facing on the 15 valve.

The hollow conical cap 20, by means of which my re-f-aeing tool issecured to the faucet I0, is illustrated in Figs. 1 and 3. As is acommon expedient, the cap 2|! is provided both interiorly and exteriorlywith screw-threads. When the faucet which is to have its valve-seatre-faced has its neck internally threaded, as in the drawing, for thereception of the stuffing-box nut through which the valve-stem projects,the cap 25 is used in the position shown in the drawing with itsexternal screw-threads co-operating with the internal screw-threads ofthe faucet-neck l2.

If the faucet i0 is of a type in which the neck 12 has external threadsfor the stufiing-box nut, the cap is reversed so that its internalthreads will co-operate with the external threads on the faucet-neck.This reversed position is not shown in the drawing, as the use of areversible conical cap threaded both interiorly and exteriorly is acommon expedient in .devices of this kind.

I have found, however, that in some faucets the neck l2 has anunthreaded portion at its upper end and that such unthreaded portion isin some instances of sufficient extent to. prevent engage- 4 ment of thethreads on the cap 20 with the threads of the neck l2. To provide forsecure attachment of the cap 20 to the faucet-neck in suchcircumstances, I provide the threaded surface .of the .cap .20 withlongitudinally extending grooves or flutes 2| and then harden the cap sothat when it is rotated in contact with a faucetneck it will .act as atap or die and cut its own thread in the neck .of the faucet.

The .cap I 2 has a central opening provided with internal threads forthe reception of an externally threaded sleeve 2,3 within which there islocated a rotatable and axially slidable shank 24 that terminates at itsupper end in a handle 25 by means of which it can be rotated. To holdthe Cir sleeve 23 in fixed position relative to the head 20, I employ alock-nut 26 which screw-threadedly receives the sleeve 23 and which canbe clamped against the end of the cap 20.

5 At its lower end, the shank 24 is adapted for attachment to a cuttinghead 21. Conveniently, the lower end of the shank 24 is reduced indiameter and provided with screw-threads adapted to enter ascrew-threaded central opening in an upwardly extending central boss 28on the cutting head 21. Preferably, the boss 28 has an external diameterequal to that of the shank 24, so that it can enter the sleeve 23. Belowthe boss 28, the cutting head has an annular shoulder 29 adapted toengage the lower end of the sleeve 23 to transmit the axial reaction ofthe cutting element as it bears against the valve-seat.

The cutting element 3| is conveniently a flat piece of hardened steelhaving near its outer lower corner a notch 32 conforming to the shape ofthe rib 4 of the valve-seat. The cutting head 21 is provided with adownwardly opening axial slot 33 of a width to receive slidably thecutting element 3|. The exterior surface of the cutting 25 head 21 isconical in order to enter valve-openings of varying diameter and toproperly center the re-facing tool.

For the purpose of locating the cutting element 3| in the proper axialposition in the slot 33 I provide a feed-rod which extendscompletelythrough the shank 24, bears against the upper surface of the cuttingelement 3|, and has at its upper end a knurled head 36. Below the head36. the feed rod 35 is provided with screw-threads 35 received in athreaded bushing 31 secured to the upper end of the shank 24.

The cutter 3| is maintained in proper angular position in the slot 33 bymeans of a guide member which is mounted in the cutter and re- 40 ceivedin a slot 4| in the cutting head 21. The slot 4| is in a planeperpendicular to that of the slot 33 and is disposed at an angle to theaxis of the head, such angle corresponding to that of the conical outersurface of the head. Therefore,

as is clear from Fig. 1, as the cutter is moved generally axially by thefeed rod 35, the cutting edge of the cutter moves generally parallel tothe adjacent portion of theconical surface of the head.

The guide member 4|] is conveniently a U- shaped piece of round wirewhich passes through two vertically spaced openings in the cutter andprojects on both sides of the cutter, as is clear from Figs. 5and 6. Thelower leg of the guide member 40 has a fairly close fit in the holewhich receives it, but the hole 42 which receives the upper leg of thecutter is elongated so as to permit a limited relative angular movementof the guide member and cutter. This possibility of angularmovement isavailed'of for the purpose of releasably holding the cutter in the head.To this end, that portion of the conical face of the head 21 which liesadjacent that side of the slot 33 through which the cutter projects isfiattened, as indicated at 43, to provide a plane surface parallel tothe slot 4|. The flat surface 43 terminates above the bottom of the headto leave a shoulder 44 which co-operates with a pin 45 in the cutter toretain the cutter, in place.

When the guide member 4|! is in the clockwise limit of that angularmovement permitted by the elongated hole 42, the cutter may be insertedinto or withdrawn from the head, the pin 45 clearing the shoulder 44.However, if the cutter is rocked in a clockwise direction after havingbeen inserted into the head, the pin 45 will be moved into closeassociated with the fiat surface 43 and behind the shoulder 44, so thatthe cutter will not drop from the head. The two conditions of relativeadjustment of the guiding member 40 and the cutter 3| are illustrated inFig. 4, the cutter being shown in full lines in the position it occupieswhen being inserted into or withdrawn from the head and in dotted-linesin the position it occupies after the operation of inserting it has beencompleted. There is sufficient friction between the'legs of theretaining member 40 and the openings which receive them to prevent anyaccidental relative movement of the cutter and guiding member.

When the device is to be used, the feed rod 35 is retracted so as topermit the cutting element 3| to rise all the way to the top of the slot33, the outer conical face of the cutting head 2? is placed in the valveseat to properly center the device, and the cap 23 is then rotated untilit has become firmly locked to the faucet-neck 2. The sleeve 33 is thenadjusted in the cap 20 until the head 21 will rotate freely in thevalve-seat'without an excessive amount of play, and the sleeve is thenlocked in position by the lock nut 26.

The feed rod 35 is then rotated to force the cutting element 3| intocontact with the annular rib 54 of the valve-seat. By rotating thehandle 25, the shank 24, head 21, and cutting element 3| will berotated, the sides of the notch 32 serving'as a cutting edge to re-facethe valve-seat. As the re-facing operation continues, the feedrod isrotated to lower the cutting element 3| until a continuous face isprovided for the valve.

I claim as my invention:

1. In a valve-seat reamer, a rotatable head, a cutting element, saidhead having a slot one end of which opens in a face of said head, aguide member mounted in said cutting element and slidably receivable insaid slot, said guide member and cutting element being relativelyangulariy adjustable to a limited extent, and two co-operating'abutments on said head and cutting element respectively, said abutmentsbeing disposed to interengage and prevent removal of the cutting elementfrom the head when said guide member and cutting element are at onelimit of relative angular adjustment and to clear each other and therebypermit removal of the cutting element from the head when the guidemember and cutting element are at the other limit of their relativeangular adjustment,

2. In a valve-seat reamer, a rotatable head adapted to enter and becentered in thehole in a valve-heat, said head having a generallyconical surface for engagement with the edges of the hole in' thevalve-seat, a cutting element mounted in said head, said cutting elementhaving a cut ting edge extending transversely of the axis of rotation ofsaid head, said cutting edge being notched to form an annular rib on thevalve-seat as the cutting element is rotated in contact therewith, meansguiding said cutting element for movement in said head along a pathsubstantial-' ly parallel to an element of said conical surface, andmeans for adjusting said cutting element along such path. v

FRANK J. PARDIECK.

